Linux Source Code Explained

I. Introduction We often see some similar in the program disassembled code 0 × 32118965 this address, the operating system called linear address, or virtual address. What is the use of virtual address? Virtual address is how to translate into physical memory address? This chapter will give a brief account of this. 1.1 Linux Memory Addressing Overview Modern operating systems are in 32-bit protected mode. Each process can generally address 4G of physical space. But our physical memory is generally hundreds of M, the process can get 4 ...

The news about the Heartbleed vulnerability sparked heated discussions on the web. This loophole from the OpenSSL project allows an attacker to steal user information over a wide variety of encrypted and transmitted network data. As OpenSSL is widely used in web servers, mail protocols, and communication protocols, the number of users affected at a time Hard to estimate. The Heartbleed Vulnerability once again shows the vulnerability of cybersecurity, of course, for those who value security, which also gives them the opportunity to upgrade basic services, increase security ...

Open source code platforms for large data are becoming popular. 　　In the past few months, almost everyone seems to have felt the impact. Low cost, flexibility and applicability to trained personnel are the main reasons for open source prosperity. Hadoop, R, and NoSQL are now the backbone of many of the enterprise's big data policies, whether they use it to manage unstructured data or perform complex statistical analyses. "It's almost impossible to keep up with it: SAP AG recently released a new product, SAP BusinessObjects Predictive analytics, software integration ...

Malware analysis, penetration testing, and computer forensics - GitHub hosts a host of compelling security tools that address the real needs of computing environments of all sizes. As the cornerstone of open source development, "all holes are superficial" has become a well-known principle or even a credo. As widely known as Linus's law, the theory that open code can improve the efficiency of project vulnerability detection is also widely accepted by IT professionals when discussing the security benefits of the open source model. Now, with the popularity of GitHub ...

OpenStack has a very high popularity, Cloudstack has plenty of money, Eucalyptus and Amazon established a close relationship. OpenStack, created jointly by Rackspace and NASA in 2010, is undoubtedly highly popular. Now it has established partnerships with giants such as At&t, IBM and Hewlett-Packard, who are committed to OpenStack as the basis for their private cloud solutions. Another open source Cloud platform Cloudsta ...

There are too many exciting emerging markets in the history of it that are the object of business. Cloud computing is no exception, if it is different, that is the more hot cloud computing. Cloud computing the whole concept of the meaning is to let the business move out more quickly, will be loaded into it annals, then, Cloud computing is the "Emperor's New Clothes" or "Enterprise IT Magic weapon"? How does the enterprise smoothly move towards the cloud computing age? November 19, on the occasion of the "2010 Red Hat Cloud Computing Conference" held in Beijing, Enet Silicon Valley Power reporter interviewed Mr. Fan Lu Wen, Vice president of Asia Pacific and president of Red Hat Greater China.

The kernel has many parameters that can be adjusted in different environments. Typically, the default defaults can meet 99% of the environmental requirements, we don ' t call the http://www.aliyun.com/zixun/aggregation/3415.html ' >advanced HOWTO for The fun of it! There is a very interesting place:/proc/sys/net, you should see. Here in the beginning did not put all the ...

Rangenetworks has introduced the world's most widely used GSM service into the southern rim of Macquarie Island. This communication network is more popular than the walkie-talkie and http://www.aliyun.com/zixun/aggregation/6154.html ">wifi network because it has a wider coverage but less power consumption." Although local communication with the rest of the world is already available via satellite telephones, this model is used primarily in the areas of security and research, local communications and ...

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The distributed computing technology proposed by Google makes it easy for developers to develop global application services, and cloud computing technology automates the management of communication, task allocation, and distributed storage among a large number of standardized (heterogeneous) computers. 　　The cloud comes from a decentralized, parallel operation, but better than the grid. Data computing cloud technology can be considered as a sub-set of grid technology, both of which are designed to hide the complexity of the system, so that users need to use it without knowing how the system works inside. The parties follow up with Google to promote cloud services, but the definition is different ...